Expansion unit for an electronic computer



FIG. 1 is a top, front and right side perspective view of an expansion unit for an electronic computer according to my design wherein the dashed lines illustrate environmental structure such as an electronic computer with which the expansion unit is employed but which forms no part of the present invention;

FIG. 2 is a top, front and right side perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a rear elevational view thereof;

FIG. 7 is a left side elevational view thereof; and,

FIG. 8 is a bottom plan view. 

The ornamental design for an "expansion unit for an electronic computer", as shown and described. 